Kakashi Gaiden will be airing in Japan in 2 weeks time as a 1 hour episode special. It will be based on how Kakashi got his sharingan if people don’t read the manga.
Also it will be able for stream on 6th August (1 week after air date) on www.naruto.com

I’ll be doing a review of it as well since its one of my favourite arcs in the naruto manga.